https://trekhleb.devGatsbyJSWed, 11 Mar 2026 08:00:40 GMThttps://trekhleb.dev/blog/2025/jobs-radar/https://trekhleb.dev/blog/2025/jobs-radar/Sun, 12 Jan 2025 00:00:00 GMTA snapshot of open job positions from the top tech companies around the world, offering insights into geographical trends in the tech job market.https://trekhleb.dev/blog/2024/api-design-x-home-timeline/https://trekhleb.dev/blog/2024/api-design-x-home-timeline/Thu, 12 Dec 2024 00:00:00 GMTAn exploration of how X's home timeline API is designedhttps://trekhleb.dev/blog/2024/system-design-sketches/https://trekhleb.dev/blog/2024/system-design-sketches/Thu, 18 Jul 2024 00:00:00 GMTSystem design sketches for popular system design interview questions.https://trekhleb.dev/blog/2023/micrograd-ts/https://trekhleb.dev/blog/2023/micrograd-ts/Mon, 07 Aug 2023 00:00:00 GMTA TypeScript version of karpathy/micrograd. A tiny scalar-valued autograd engine and a neural net on top of it.https://trekhleb.dev/blog/2023/observations/https://trekhleb.dev/blog/2023/observations/Tue, 27 Jun 2023 00:00:00 GMTMy subjective observations, assumptions, questions, and interpretations about the world around us. Ultimate origin, science, Creator, theories, axioms, consciousness, universe, God's sensor, good vs evil, etc. Don't take it seriously.https://trekhleb.dev/blog/2022/solid-principles-sketches/https://trekhleb.dev/blog/2022/solid-principles-sketches/Thu, 06 Oct 2022 00:00:00 GMTSOLID programming principles explained with minimalistic sketches and real-world exampleshttps://trekhleb.dev/blog/2022/data-structure-sketches/https://trekhleb.dev/blog/2022/data-structure-sketches/Wed, 31 Aug 2022 00:00:00 GMTBasic data structures explained with minimalistic sketcheshttps://trekhleb.dev/blog/2022/okso/https://trekhleb.dev/blog/2022/okso/Wed, 20 Jul 2022 00:00:00 GMTThe OkSo is a drawing app to express, grasp, and organize your thoughts and ideas. Draw to explain. Draw to grasp.https://trekhleb.dev/blog/2021/top-33-javascript-projects-on-github/https://trekhleb.dev/blog/2021/top-33-javascript-projects-on-github/Sat, 13 Nov 2021 00:00:00 GMTSnapshot of the 33 most starred open-sourced JavaScript repositories on GitHub as of November 2021https://trekhleb.dev/blog/2021/self-parking-car-evolution/https://trekhleb.dev/blog/2021/self-parking-car-evolution/Tue, 28 Sep 2021 00:00:00 GMTTraining the car to do self-parking using a genetic algorithmhttps://trekhleb.dev/blog/2021/binary-floating-point/https://trekhleb.dev/blog/2021/binary-floating-point/Fri, 16 Jul 2021 00:00:00 GMTAnti-intuitive but yet interactive example of how the floating-point numbers like -27.156 are stored in binary format in a computer's memoryhttps://trekhleb.dev/blog/2021/content-aware-image-resizing-in-javascript/https://trekhleb.dev/blog/2021/content-aware-image-resizing-in-javascript/Fri, 16 Apr 2021 00:00:00 GMTJavaScript implementation of so-called Seam Carving algorithm for the content-aware image resizing and objects removal. Dynamic programming approach is applied to optimize the resizing time.https://trekhleb.dev/blog/2021/gyro-web/https://trekhleb.dev/blog/2021/gyro-web/Tue, 02 Mar 2021 00:00:00 GMTAccessing the device orientation using React hook, and rotating a CSS 3D cube afterwardshttps://trekhleb.dev/blog/2020/top-33-javascript-projects-on-github-december/https://trekhleb.dev/blog/2020/top-33-javascript-projects-on-github-december/Thu, 10 Dec 2020 00:00:00 GMTSnapshot of 33 most starred open-sourced JavaScript repositories on GitHub as of Decemberhttps://trekhleb.dev/blog/2020/printed-links-detection/https://trekhleb.dev/blog/2020/printed-links-detection/Tue, 01 Dec 2020 00:00:00 GMTIn this article we will start solving the issue of making the printed links (i.e. in a book or in a magazine) clickable via your smartphone camerahttps://trekhleb.dev/blog/2020/recipes-generation/https://trekhleb.dev/blog/2020/recipes-generation/Thu, 18 Jun 2020 00:00:00 GMTI've trained a character-level LSTM RNN on ~100k recipes dataset using TensorFlow, and it suggested me to cook Cream Soda with Onions, Puff Pastry Strawberry Soup, Zucchini flavor Tea and Salmon Mousse of Beef and Stilton Salad with Jalapenoshttps://trekhleb.dev/blog/2020/this-is-how-social-media-could-ruin-your-happiness/https://trekhleb.dev/blog/2020/this-is-how-social-media-could-ruin-your-happiness/Thu, 11 Jun 2020 00:00:00 GMTThe recipe for how you can ruin your happiness and start feeling miserable using social mediahttps://trekhleb.dev/blog/2020/machine-learning-experiments/https://trekhleb.dev/blog/2020/machine-learning-experiments/Tue, 05 May 2020 00:00:00 GMTRecognize digits and sketches. Detect objects. Classify images. Write a Shakespeare poem. All with TensorFlow 2 models demo.https://trekhleb.dev/blog/2020/coronavirus-covid-19-dashboard/https://trekhleb.dev/blog/2020/coronavirus-covid-19-dashboard/Mon, 23 Mar 2020 00:00:00 GMTCoronavirus (COVID-19) dashboard to show the dynamics of Сoronavirus distribution per countryhttps://trekhleb.dev/blog/2020/state-of-the-art-shitcode-principles/https://trekhleb.dev/blog/2020/state-of-the-art-shitcode-principles/Tue, 28 Jan 2020 00:00:00 GMTThis a list of state-of-the-art shitcode principles your project should follow.https://trekhleb.dev/blog/2019/nano-neuron/https://trekhleb.dev/blog/2019/nano-neuron/Fri, 06 Dec 2019 00:00:00 GMTThe NanoNeuron.js code example contains 7 simple JavaScript functions (which touches on model prediction, cost calculation, forward/backwards propagation, and training) that will give you a feeling of how machines can actually learn. No 3rd-party libraries, no external data-sets or dependencies, only pure and simple JavaScript functions.https://trekhleb.dev/blog/2019/react-useposition-hook/https://trekhleb.dev/blog/2019/react-useposition-hook/Sun, 30 Jun 2019 00:00:00 GMTDecoupling of geolocation logic into React hookhttps://trekhleb.dev/blog/2019/technical-interview-preparation-checklist/https://trekhleb.dev/blog/2019/technical-interview-preparation-checklist/Tue, 07 May 2019 00:00:00 GMTUseful insights from recruiters that they normally send to applicants before the technical interviewshttps://trekhleb.dev/blog/2019/most-trending-jupyter-notebooks-of-december/https://trekhleb.dev/blog/2019/most-trending-jupyter-notebooks-of-december/Tue, 01 Jan 2019 00:00:00 GMTA list of 25 most trending Jupyter Notebooks on GitHub as for December, 2018https://trekhleb.dev/blog/2018/homemade-machine-learning-in-python/https://trekhleb.dev/blog/2018/homemade-machine-learning-in-python/Fri, 21 Dec 2018 00:00:00 GMTMatLab/Octave examples of popular machine learning algorithms with code examples and mathematics being explainedhttps://trekhleb.dev/blog/2018/machine-learning-in-matlaboctave/https://trekhleb.dev/blog/2018/machine-learning-in-matlaboctave/Wed, 31 Oct 2018 00:00:00 GMTMatLab/Octave examples of popular machine learning algorithms with code examples and mathematics being explainedhttps://trekhleb.dev/blog/2018/playground-and-cheatsheet-for-learning-python/https://trekhleb.dev/blog/2018/playground-and-cheatsheet-for-learning-python/Wed, 29 Aug 2018 00:00:00 GMTCollection of Python scripts that are split by topics and contain code examples with explanations, different use caseshttps://trekhleb.dev/blog/2018/top-33-javascript-projects-on-github-august-2018/https://trekhleb.dev/blog/2018/top-33-javascript-projects-on-github-august-2018/Sat, 18 Aug 2018 00:00:00 GMTTop of JavaScript projects as for 2018https://trekhleb.dev/blog/2018/playing-with-discrete-fourier-transform-algorithm/https://trekhleb.dev/blog/2018/playing-with-discrete-fourier-transform-algorithm/Fri, 17 Aug 2018 00:00:00 GMTComplex but yet magical topic!https://trekhleb.dev/blog/2018/extend-your-limits-rather-than-your-ambitions/https://trekhleb.dev/blog/2018/extend-your-limits-rather-than-your-ambitions/Mon, 16 Jul 2018 00:00:00 GMTExtending ambitions rather than limits will bring nothing more than additional stress, unhappiness and dissatisfaction to our lives.https://trekhleb.dev/blog/2018/gift-of-24-hours/https://trekhleb.dev/blog/2018/gift-of-24-hours/Tue, 03 Jul 2018 00:00:00 GMTAdvice on how to spend the 24 hours you have more productivelyhttps://trekhleb.dev/blog/2018/permutations-combinations-cheat-sheet/https://trekhleb.dev/blog/2018/permutations-combinations-cheat-sheet/Fri, 29 Jun 2018 00:00:00 GMTThis article briefly describes the difference between mathematical permutations and combinations,explains the main idea behind permutations and combinations algorithms and contains links to algorithms implementation in JavaScript.https://trekhleb.dev/blog/2018/dynamic-programming-vs-divide-and-conquer/https://trekhleb.dev/blog/2018/dynamic-programming-vs-divide-and-conquer/Fri, 15 Jun 2018 00:00:00 GMTIn this article I’m trying to explain the difference/similarities between dynamic programing and divide and conquer approaches based on two examples - binary search and minimum edit distance (Levenshtein distance)https://trekhleb.dev/blog/2018/links-to-promote-your-next-startup/https://trekhleb.dev/blog/2018/links-to-promote-your-next-startup/Mon, 11 Jun 2018 00:00:00 GMTThe list of 50+ platforms you may use to promote your next projecthttps://trekhleb.dev/blog/2018/algorithms-and-data-structures-in-javascript/https://trekhleb.dev/blog/2018/algorithms-and-data-structures-in-javascript/Mon, 21 May 2018 00:00:00 GMTCollection of classic algorithms and data structures implemented in ES6 JavaScript with explanations and links to further readings and YouTube videoshttps://trekhleb.dev/blog/2018/aggregatus-service-is-live/https://trekhleb.dev/blog/2018/aggregatus-service-is-live/Wed, 07 Mar 2018 00:00:00 GMTAggregate data from many sources into one collectionhttps://trekhleb.dev/blog/2017/docker-whale-in-digital-ocean/https://trekhleb.dev/blog/2017/docker-whale-in-digital-ocean/Wed, 30 Aug 2017 00:00:00 GMTThe main idea is to automate project’s code and environment deployment to production and to make this process to be smooth and easyhttps://trekhleb.dev/blog/2017/if-you-ever-used-subway-you-should-know-what-binary-search-tree-is/https://trekhleb.dev/blog/2017/if-you-ever-used-subway-you-should-know-what-binary-search-tree-is/Thu, 13 Jul 2017 00:00:00 GMTBinary search trees, sometimes called ordered or sorted binary trees, are a particular type of container… bla…bla…bla… Stop!https://trekhleb.dev/blog/2017/dangerous-step-from-agile-to-fragile/https://trekhleb.dev/blog/2017/dangerous-step-from-agile-to-fragile/Sat, 24 Jun 2017 00:00:00 GMTThe dangerous step is — to FIX price, deadlines and vague scope for long-term project and at the same time try to be AGILE in development process.https://trekhleb.dev/blog/2017/solid-principles-around-you/https://trekhleb.dev/blog/2017/solid-principles-around-you/Tue, 20 Jun 2017 00:00:00 GMTReal-world visual examples of SOLID principleshttps://trekhleb.dev/blog/2017/how-to-create-aot-jit-compatible-angular-4-library/https://trekhleb.dev/blog/2017/how-to-create-aot-jit-compatible-angular-4-library/Wed, 07 Jun 2017 00:00:00 GMTExample of how to create a re-usable npm library for Angular projects